  # Increase and Decrease Numbers by the Given Percentages

In this worksheet, students practise decreasing numbers by the given percentages. They can use a calculator to help. Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Define, Interpret and Compare Percentages

Difficulty level:   #### Worksheet Overview

In this worksheet, we will learn how to increase and decrease numbers by a given percentage using a calculator.

Methods and Examples

A whole number or quantity is 100%.

Increasing a number by 10% gives 100% + 10% = 110% of the number or 1.1 × the number. So 25cm increased by 10% is 1.1 × 25 = 27.5 cm.

Decreasing a number by 15% gives 100% - 15% = 85% of the number or 0.85 × the number. So 25cm decreased by 15% is 0.85 × 25 = 21.25 cm.

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